If your semi-dynamic pages are made through a single subroutine call (or you can wrap the rendering of these pages in such a call) then Memoize might be something to look into. It has the possibility to "cache" the calls to this subroutine to disk if necessary.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James